Water Flow Message (Seaway)
Registrant:
Saint Lawrence Seaway Development Corporation
DAC:
366
FI:
1
State:
in force
Used by:
Saint Lawrence Seaway Development Corporation
Number of slots (max):
5
Reporting Rate:
Each individual Seaway message has an assigned update interval established by the Seaway Traffic Management System (TMS). However, the AIS network may elect to retransmit any messages, system resources permitting, at more frequent intervals.
Permitted as from:
09/03/2002
Technical point of contact:
U.S. Department of Transportation
John A. Volpe
Transportation Systems Center
55 Broadway
Cambridge, MA 02142
Details:
| Parameter | Number of bits | Description | |
| Designated Area Code |
10 | The Designated Area Code will be 366 for the United States or 316 for Canada depending on the location of transmitter. Refer to Section 1.1 for description |
|
| Function Identifier | 6 | FI=1 | |
| Reserved | 2 | ||
| Message ID | 6 | Message Identifier = 6 (00 0110 in binary) | |
| Binary Data | Max 864 | Message contains 1 to 6 water level reports, each structured as defined in next table. | |
| Total Number of bits | Max 888 | = 24 + N*144 | |
| N Total Bits | (Slots Required) | ||
| 1 168 bits | (2 slots) | ||
| 2 312 bits | (2 slots) | ||
| 3 456 bits | (3 slots) | ||
| 4 600 bits | (4 slots) | ||
| 5 744 bits | (4 slots) | ||
| 6 888 bits | (5 slots) | ||
Water Flow Report
| Parameter | Number of bits | Description |
| Timetag | 20 | Month, Day and Time of measurement, See UTC Time |
| Station ID | 42 | Seven 6-bit ASCII character ID |
| Longitude | 25 | Longitude in 1/1000 minute (±180 degrees, East = positive, West = negative. 181 degrees = not available) |
| Latitude | 24 | Latitude in 1/1000 minute (±90 degrees, North = positive, South = negative. 91 degrees = not available) |
| Water Level | 14 | Water flow in cubic meters per second (16383 = Not Available) |
| Reserved | 19 | Reserved bits for future use |
| Total Number of bits | 144 |